Mold for making brass castings.



PATENTED NOV. 24, 1903. F. J. PRIESE & J. E. GILBERT. MOLD FOR MAKING BRASS GASTINGS.

APPLICATION FILED JULY 28, 1902.

N0 MODE L.

IIIL I 7 ZZWZT 75/ ZW Jnl UNITED STATES Patented November 24, 1903.

PATENT FFICE.

FRANK J. FRIESE AND JOHN E. GILBERT, OF ST. LOUIS, MISSOURI, ASSIGNORS OF TWO-THIRDS TO EDWARD A. MORE, OF ST. LOUIS,

MISSOURI.

SPECIFICATION forming part of Letters Patent N 0. 745,005, dated November 24, 1903.

Application filed July 28, 1902. Serial No. 117,323. (No model.)

To all whom it may concern:

Be it known that we, FRANK J. FRIESE and JOHN E. GILBERT, citizens of the United States, residing in the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Molds for Making Brass Castings, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

Where it can be done, it is much cheaper to make metal castings in metallic molds than it is to make them in sand molds, inasmuch as a metallic mold can be used indefinitely, while a fresh sand mold has to be made for each casting. Ileretofore it has not to our knowledge been practicable to make brass castings in metallic molds owing to the difficulty of getting the molten metal to lie smoothly against the metallic mold, the result of previous efforts in this direction being that the casting would. have rough and porous surfaces. After a series of experiments along this line we have discovered that if the interior of a metallic mold is coated with an aluminium paint the molten brass will lie quietly to the surface of the mold when introduced, the result being a perfectly smooth and uniform casting, and we are thus enabled to avail ourselves of the economy of using metallic molds instead of sand molds for the production of brass castings, and to this end our invention consists of a metallic mold for making metal castings the cavity of which is coated with finely-divided aluminium sus pended in a suitable carrier.

Our invention consists in features of novelty hereinafter fully described, and pointed out in the claims.

Figure I is a perspective view of a metallic mold, which per se may be of any desired shape and size to suit the casting that is to be made. Fig. II is a transverse section taken on line II II, Fig. I. Fig. III is an inside view of one half of the mold with the connection-bolts in cross-section. Fig. IV is an inside view of the other half of the mold.

-We have shown a mold formed for making smooth perfect casting.

journal-bearings or brasses for car-axle boxes, and the interior of the mold is of course so shaped that the desired form will be given to the casting. The mold as we have shown it is made in two parts 1 and 2, that are connected together by means of bolts 3, pivoted to cars l on one half of the mold and fitting in slotted ears 5 on the other half of the mold, the bolts being provided with nuts 6, by which the two parts of the mold are securely fastened together. The mold is provided with an ordinary form of gate 7, formed in the two parts of the mold at one side of the mold-cavity. One half of the mold has branches or sprues leading from the gate into the mold-cavity, as shown in Fig. IV. The mold also has the common vent-opening 8. Each half of the mold is provided with a handle 9, by which it may be moved about.

The interior of the mold-cavity, and preferably the interior also of the gate 7 and vent 8, is coated with an aluminiumpaint, as indicated by the stickle-marks in Figs. III and IV. WVhen the interior of the mold has been thus coated with an aluminium paint, the molten brass will, we have found by experience, lie smoothly and quietly to the interior face of the mold, the result being a WVe have found that a single coating is sufficient for making a number of castings; but if the mold is used constantly it should be given a fresh coat of the paint each day.

WVe claim as our invention- 1. A metallic mold for making metal castings,,the cavity of which is coated with finelydivided aluminium suspended in a suitable carrier, substantially as set forth.

2. A metallic mold for making brass castings, the cavity of which is coated with an aluminium paint, substantially as set forthf FRANK J. FRIESE. JOHN E. GILBERT.

In presence of- E. S. KNIGHT, M. P. SMITH. 

